package job2;

import java.util.concurrent.locks.LockSupport;

/**
 * Object的wait和notify
 */
public class Main6 {

    private static int result;

    public static void main(String[] args) throws Exception {
        long start = System.currentTimeMillis();

        // 在这里创建一个线程或线程池，
        // 异步执行 下面方法
        Thread thread = new Thread(() -> {
            synchronized (Main6.class) {
                result = sum();
                //唤醒主线程
                Main6.class.notify();
            }
        });
        synchronized (Main6.class) {
            thread.start();
            //主线程阻塞
            Main6.class.wait();
        }

        // 确保  拿到result 并输出
        System.out.println("异步计算结果为：" + result);
        System.out.println("使用时间：" + (System.currentTimeMillis() - start) + " ms");
    }

    private static int sum() {
        return fibo(36);
    }

    private static int fibo(int a) {
        if (a < 2)
            return 1;
        return fibo(a - 1) + fibo(a - 2);
    }

}
